The aluminium Rings, which measure 12 metres in width, have been installed in Terminal 5 International Arrivals and will be seen by at least two million passengers travelling through Heathrow.
They were officially launched at a special event today attended by Olympian Mark Foster, with entertainment provided by the Band of the Irish Guards.
Mark Foster said: ‘I know first-hand the nervous excitement that every athlete feels when they arrive for the Olympic Games. The atmosphere is electric and often the airport is the first time we see fans and really feel the special buzz of the weeks to come.
‘The Rings will create a huge sense of excitement and be a great part of the welcome for everyone travelling though the Terminal.’
The Olympic Rings are one of the world’s most recognisable logos, representing the union of the five continents and the meeting of athletes from throughout the world at the Olympic Games.
Giant Olympic Rings are being installed at iconic sites across the United Kingdom to excite and inspire people ahead of the Games, with sets unveiled at Edinburgh and Newcastle last week.
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View a gallery of the giant Olympic Rings around the UK